{"id":1538,"date":"2026-08-18T16:19:58","date_gmt":"2026-08-18T16:19:58","guid":{"rendered":"https:\/\/benlongkj.com\/?p=1538"},"modified":"2026-08-18T16:39:54","modified_gmt":"2026-08-18T16:39:54","slug":"how-to-test-continuity-with-a-multimeter","status":"publish","type":"post","link":"https:\/\/benlongkj.com\/vi\/blog\/how-to-test-continuity-with-a-multimeter\/","title":{"rendered":"C\u00e1ch Ki\u1ec3m Tra Li\u00ean T\u1ee5c V\u1edbi \u0110\u1ed3ng H\u1ed3 V\u1ea1n N\u0103ng"},"content":{"rendered":"<p>M\u1ed7i th\u1ee3 \u0111i\u1ec7n, k\u1ef9 thu\u1eadt vi\u00ean v\u00e0 ng\u01b0\u1eddi l\u00e0m DIY \u0111\u1ec1u mang g\u00e1nh n\u1eb7ng c\u1ee7a c\u00f9ng m\u1ed9t t\u00ecnh hu\u1ed1ng kh\u00f3 x\u1eed: d\u00e2y n\u00e0y c\u00f3 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i \u0111\u00fang c\u00e1ch kh\u00f4ng? C\u1ea7u ch\u00ec n\u00e0y c\u00f3 b\u1ecb ch\u00e1y kh\u00f4ng? C\u00f4ng t\u1eafc n\u00e0y c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ea5u d\u00e2y \u0111\u00fang kh\u00f4ng? C\u00e1p n\u00e0y c\u00f3 th\u1ec3 b\u1ecb h\u01b0 h\u1ea1i \u1edf \u0111\u00e2u \u0111\u00f3 b\u00ean trong l\u1edbp c\u00e1ch \u0111i\u1ec7n kh\u00f4ng? Gi\u1ea3i ph\u00e1p nhanh nh\u1ea5t cho v\u1ea5n \u0111\u1ec1 \u0111\u00f3 l\u00e0 th\u1ef1c hi\u1ec7n ki\u1ec3m tra li\u00ean t\u1ee5c b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u2014 m\u1ed9t quy tr\u00ecnh hai ph\u00fat cho bi\u1ebft \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111i t\u1eeb \u0111i\u1ec3m n\u00e0y \u0111\u1ebfn \u0111i\u1ec3m kh\u00e1c hay kh\u00f4ng. H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd gi\u00fap b\u1ea1n: n\u00f3 ch\u1ec9 cho b\u1ea1n c\u00e1ch chu\u1ea9n b\u1ecb cho ki\u1ec3m tra li\u00ean t\u1ee5c, c\u00e1ch thi\u1ebft l\u1eadp \u0111\u1ed3ng h\u1ed3, c\u00e1ch ph\u00e2n t\u00edch k\u1ebft qu\u1ea3 v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p an to\u00e0n \u0111\u1ec3 gi\u1eef cho vi\u1ec7c ki\u1ec3m tra an to\u00e0n.<\/p>\n<blockquote><p>Tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn: \u0110\u1ec3 th\u1ef1c hi\u1ec7n ki\u1ec3m tra li\u00ean t\u1ee5c, b\u1ea1n n\u00ean l\u00e0m theo c\u00e1c b\u01b0\u1edbc: Ng\u1eaft ngu\u1ed3n \u0111i\u1ec7n kh\u1ecfi m\u1ea1ch, \u0111\u1eb7t \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u1edf ch\u1ebf \u0111\u1ed9 li\u00ean t\u1ee5c, ki\u1ec3m tra xem k\u1ebft n\u1ed1i que \u0111o c\u00f3 ph\u00e1t ra ti\u1ebfng b\u00edp \u0111\u1ec3 x\u00e1c nh\u1eadn kh\u00f4ng, ki\u1ec3m tra c\u1ea3 hai \u0111\u1ea7u c\u1ee7a v\u1eadt c\u1ea7n ki\u1ec3m tra b\u1eb1ng que \u0111o v\u00e0 ki\u1ec3m tra k\u1ebft qu\u1ea3 tr\u00ean \u0111\u1ed3ng h\u1ed3; \u0111\u1ed3ng h\u1ed3 c\u1ee7a b\u1ea1n s\u1ebd ph\u00e1t ra ti\u1ebfng b\u00edp ho\u1eb7c hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb g\u1ea7n b\u1eb1ng kh\u00f4ng trong tr\u01b0\u1eddng h\u1ee3p k\u1ebft n\u1ed1i t\u1ed1t, ng\u01b0\u1ee3c l\u1ea1i b\u1ea1n s\u1ebd th\u1ea5y OL ho\u1eb7c 1 tr\u00ean m\u00e0n h\u00ecnh.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1539\" src=\"https:\/\/benlongkj.com\/wp-content\/uploads\/2026\/08\/How-to-Test-Continuity-with-a-Multimeter.webp\" alt=\"C\u00e1ch Ki\u1ec3m Tra Li\u00ean T\u1ee5c V\u1edbi \u0110\u1ed3ng H\u1ed3 V\u1ea1n N\u0103ng\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Ki\u1ec3m tra \u0111\u1ed9 li\u00ean t\u1ee5c l\u00e0 g\u00ec &amp; T\u1ea1i sao n\u00f3 quan tr\u1ecdng<\/h2>\n<p>Li\u00ean t\u1ee5c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t m\u1ea1ch \u0111i\u1ec7n duy tr\u00ec kh\u00f4ng b\u1ecb gi\u00e1n \u0111o\u1ea1n gi\u1eefa hai \u0111i\u1ec3m tr\u00ean m\u1ea1ch. Ki\u1ec3m tra li\u00ean t\u1ee5c l\u00e0 m\u1ed9t b\u00e0i ki\u1ec3m tra \u0111\u1ec3 ki\u1ec3m tra c\u00e1ch \u0111i\u1ec7n ch\u1ea1y gi\u1eefa hai \u0111i\u1ec3m trong m\u1ea1ch \u0111i\u1ec7n. N\u1ebfu t\u1ed3n t\u1ea1i m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn li\u00ean t\u1ee5c, d\u00f2ng \u0111i\u1ec7n s\u1ebd ch\u1ea1y qua n\u00f3 v\u00e0 \u0111\u1ed3ng h\u1ed3 s\u1ebd ph\u00e1t ra ti\u1ebfng b\u00edp ho\u1eb7c hi\u1ec3n th\u1ecb g\u1ea7n b\u1eb1ng kh\u00f4ng ohm. N\u1ebfu kh\u00f4ng c\u00f3 \u0111\u01b0\u1eddng d\u1eabn ho\u00e0n ch\u1ec9nh (v\u00ed d\u1ee5, d\u00e2y b\u1ecb \u0111\u1ee9t, c\u1ea7u ch\u00ec b\u1ecb ch\u00e1y ho\u1eb7c c\u00f4ng t\u1eafc m\u1edf), d\u00f2ng \u0111i\u1ec7n kh\u00f4ng th\u1ec3 ch\u1ea1y qua \u0111\u01b0\u1eddng d\u1eabn v\u00e0 \u0111\u1ed3ng h\u1ed3 kh\u00f4ng ph\u00e1t ra \u00e2m thanh (hi\u1ec3n th\u1ecb OL).<\/p>\n<p>T\u1ea7m quan tr\u1ecdng c\u1ee7a ki\u1ec3m tra li\u00ean t\u1ee5c: \u0111\u00e2y l\u00e0 c\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 ki\u1ec3m tra li\u00ean t\u1ee5c m\u00e0 kh\u00f4ng c\u1ea7n ngu\u1ed3n \u0111i\u1ec7n t\u1ea1i b\u1ea5t k\u1ef3 \u0111i\u1ec3m n\u00e0o. Ki\u1ec3m tra li\u00ean t\u1ee5c th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng:<\/p>\n<ul>\n<li>\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh xem c\u00f3 d\u00e2y b\u1ecb \u0111\u1ee9t trong c\u00e1p hay kh\u00f4ng.<\/li>\n<li>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o c\u1ea7u ch\u00ec c\u00f2n nguy\u00ean v\u1eb9n tr\u01b0\u1edbc khi thay th\u1ebf.<\/li>\n<li>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00f4ng t\u1eafc ho\u1eb7c ti\u1ebfp \u0111i\u1ec3m r\u01a1 le m\u1edf khi \u0111\u01b0\u1ee3c b\u1eadt.<\/li>\n<li>\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh d\u00e2y d\u1eabn n\u00e0o trong c\u00e1p \u0111a l\u00f5i l\u00e0 d\u00e2y n\u00e0o.<\/li>\n<li>\u0110\u1ec3 ki\u1ec3m tra li\u00ean t\u1ee5c n\u1ed1i \u0111\u1ea5t\/\u0111\u1ea5t.<\/li>\n<li>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o vi\u1ec7c \u00e9p \u0111\u1ea7u n\u1ed1i ho\u1eb7c h\u00e0n \u0111\u1ea7u n\u1ed1i ho\u1eb7c \u0111\u1ea7u c\u1ed1t \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u00fang c\u00e1ch.<\/li>\n<\/ul>\n<h2>Nh\u1eefng g\u00ec b\u1ea1n c\u1ea7n tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u<\/h2>\n<p>Vi\u1ec7c ki\u1ec3m tra ch\u1ec9 m\u1ea5t v\u00e0i gi\u00e2y; chu\u1ea9n b\u1ecb m\u1ea5t m\u1ed9t ph\u00fat. H\u00e3y chu\u1ea9n b\u1ecb nh\u1eefng th\u1ee9 sau:<\/p>\n<table>\n<thead>\n<tr>\n<th>M\u1ee5c<\/th>\n<th>T\u1ea1i sao b\u1ea1n c\u1ea7n n\u00f3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng k\u1ef9 thu\u1eadt s\u1ed1 (DMM)<\/strong><\/td>\n<td>Thi\u1ebft b\u1ecb ki\u1ec3m tra; b\u1ea5t k\u1ef3 DMM c\u01a1 b\u1ea3n n\u00e0o c\u0169ng c\u00f3 ch\u1ebf \u0111\u1ed9 \u0111o \u0111\u1ed9 li\u00ean t\u1ee5c<\/td>\n<\/tr>\n<tr>\n<td><strong>Hai d\u00e2y \u0111o<\/strong><\/td>\n<td>M\u00e0u \u0111\u1ecf v\u00e0 \u0111en, c\u00f3 que \u0111o; c\u1eafm v\u00e0o \u0111\u1ed3ng h\u1ed3<\/td>\n<\/tr>\n<tr>\n<td><strong>Tham chi\u1ebfu \u0111\u00e3 bi\u1ebft t\u1ed1t<\/strong><\/td>\n<td>M\u1ed9t \u0111o\u1ea1n d\u00e2y ng\u1eafn, ho\u1eb7c ch\u1ea1m c\u00e1c que \u0111o v\u00e0o nhau \u2014 \u0111\u1ec3 x\u00e1c nh\u1eadn \u0111\u1ed3ng h\u1ed3 ho\u1ea1t \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td><strong>Pin m\u1edbi ho\u1eb7c \u0111\u00e3 s\u1ea1c \u0111\u1ea7y<\/strong><\/td>\n<td>Pin y\u1ebfu cho k\u1ebft qu\u1ea3 \u0111o sai; nhi\u1ec1u \u0111\u1ed3ng h\u1ed3 hi\u1ec3n th\u1ecb bi\u1ec3u t\u01b0\u1ee3ng pin<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u0103ng c\u00e1ch \u0111i\u1ec7n\/b\u0103ng d\u00ednh ho\u1eb7c k\u1eb9p<\/strong><\/td>\n<td>\u0110\u1ec3 gi\u1eef \u0111\u1ea7u que \u0111o \u1ed5n \u0111\u1ecbnh tr\u00ean \u0111i\u1ec3m ki\u1ec3m tra<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>K\u1ef9 n\u0103ng duy nh\u1ea5t b\u1ea1n c\u1ea7n l\u00e0 \u0111\u1ecdc \u0111\u1ed3ng h\u1ed3 v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc \u0111\u01b0\u1ee3c n\u00eau d\u01b0\u1edbi \u0111\u00e2y. Tu\u00e2n th\u1ee7 c\u00e1c quy t\u1eafc an to\u00e0n l\u00e0 \u0111i\u1ec1u thi\u1ebft y\u1ebfu, v\u00ec thi\u1ebft b\u1ecb ki\u1ec3m tra li\u00ean t\u1ee5c v\u00e0 d\u00f2ng \u0111i\u1ec7n s\u1ed1ng kh\u00f4ng bao gi\u1edd n\u00ean tr\u1ed9n l\u1eabn.<\/p>\n<h2>An to\u00e0n l\u00e0 tr\u00ean h\u1ebft: C\u00e1c quy t\u1eafc kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i<\/h2>\n<ul>\n<li>T\u1eaft m\u1ea1ch. Ki\u1ec3m tra li\u00ean t\u1ee5c ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch g\u1eedi m\u1ed9t d\u00f2ng \u0111i\u1ec7n r\u1ea5t nh\u1ecf qua m\u1ea1ch \u2013 kh\u00f4ng c\u1ea7n th\u1ef1c hi\u1ec7n khi c\u00f3 \u0111i\u1ec7n s\u1ed1ng. C\u1ea7n t\u1eaft c\u1ea7u dao ho\u1eb7c ng\u1eaft m\u1ea1ch tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh ki\u1ec3m tra v\u1edbi s\u1ef1 tr\u1ee3 gi\u00fap c\u1ee7a b\u1ed9 ki\u1ec3m tra \u0111i\u1ec7n \u00e1p ho\u1eb7c c\u1ea5u h\u00ecnh \u0111\u1ed3ng h\u1ed3 ph\u00f9 h\u1ee3p \u1edf ch\u1ebf \u0111\u1ed9 \u0111o \u0111i\u1ec7n \u00e1p.<\/li>\n<li>X\u1ea3 t\u1ee5 \u0111i\u1ec7n. C\u00e1c t\u1ee5 \u0111i\u1ec7n c\u00f3 th\u1ec3 l\u01b0u tr\u1eef n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n ho\u1ea1t \u0111\u1ed9ng nh\u01b0 ngu\u1ed3n cung c\u1ea5p d\u00f2ng \u0111i\u1ec7n qua que \u0111o c\u1ee7a b\u1ea1n. X\u1ea3 c\u00e1c t\u1ee5 \u0111i\u1ec7n l\u1edbn tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh ki\u1ec3m tra.<\/li>\n<li>Ng\u1eaft k\u1ebft n\u1ed1i \u00edt nh\u1ea5t m\u1ed9t \u0111\u1ea7u c\u00e1p. N\u1ebfu b\u1ea1n c\u1ea7n ki\u1ec3m tra m\u1ed9t d\u00e2y, b\u1ea1n c\u1ea7n ng\u1eaft n\u00f3 kh\u1ecfi m\u1ea1ch, n\u1ebfu kh\u00f4ng c\u00f3 th\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng tin sai l\u1ec7ch do ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c.<\/li>\n<li>Kh\u00f4ng ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c tr\u00ean thi\u1ebft b\u1ecb \u0111ang ho\u1ea1t \u0111\u1ed9ng. Ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c kh\u00f4ng li\u00ean quan \u0111\u1ebfn vi\u1ec7c truy\u1ec1n t\u1ea3i \u0111i\u1ec7n n\u0103ng qua m\u1ea1ch v\u00e0 c\u00f3 th\u1ec3 g\u00e2y h\u01b0 h\u1ecfng \u0111\u1ed3ng h\u1ed3 \u0111o.<\/li>\n<\/ul>\n<h2>Bi\u1ec3u t\u01b0\u1ee3ng ki\u1ec3m tra li\u00ean t\u1ee5c tr\u00ean \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng<\/h2>\n<p>Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng k\u1ef9 thu\u1eadt s\u1ed1 c\u00f3 ch\u1ee9c n\u0103ng ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c chia s\u1ebb khe v\u1edbi ch\u1ee9c n\u0103ng \u0111o \u0111i\u1ec7n tr\u1edf, \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng gi\u1ed1ng nh\u01b0:<\/p>\n<ul>\n<li>Bi\u1ec3u t\u01b0\u1ee3ng s\u00f3ng \u00e2m d\u01b0\u1edbi d\u1ea1ng \u0111\u01b0\u1eddng cong v\u1edbi nhi\u1ec1u s\u00f3ng ph\u00e1t ra (bi\u1ec3u t\u01b0\u1ee3ng IEC ph\u1ed5 bi\u1ebfn cho \u201ct\u00ednh li\u00ean t\u1ee5c c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c\u201d), ho\u1eb7c<\/li>\n<li>Bi\u1ec3u t\u01b0\u1ee3ng ohm (\u03a9) c\u00f3 ho\u1eb7c kh\u00f4ng c\u00f3 bi\u1ec3u t\u01b0\u1ee3ng s\u00f3ng \u00e2m, ho\u1eb7c<\/li>\n<li>Ch\u1ec9 bi\u1ec3u t\u01b0\u1ee3ng ohm (\u03a9) \u2014 trong c\u00e1c thi\u1ebft b\u1ecb \u0111\u01a1n gi\u1ea3n, t\u00ednh li\u00ean t\u1ee5c x\u1ea3y ra \u1edf ph\u1ea1m vi \u0111i\u1ec7n tr\u1edf th\u1ea5p nh\u1ea5t.<\/li>\n<\/ul>\n<p>N\u1ebfu thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n c\u00f3 c\u00e0i \u0111\u1eb7t t\u00ednh li\u00ean t\u1ee5c ri\u00eang bi\u1ec7t (c\u00f3 th\u1ec3 l\u00e0 bi\u1ec3u t\u01b0\u1ee3ng s\u00f3ng \u00e2m v\u00e0 \u0111\u00f4i khi c\u00f3 bi\u1ec3u t\u01b0\u1ee3ng loa), h\u00e3y chuy\u1ec3n thi\u1ebft b\u1ecb sang \u0111\u00f3 \u2014 t\u00edn hi\u1ec7u s\u1ebd t\u1ef1 \u0111\u1ed9ng ph\u00e1t ra \u00e2m thanh. N\u1ebfu kh\u00f4ng c\u00f3 c\u00e0i \u0111\u1eb7t t\u00ednh li\u00ean t\u1ee5c, h\u00e3y \u0111\u1eb7t n\u00f3 \u1edf m\u1ee9c \u0111i\u1ec7n tr\u1edf th\u1ea5p nh\u1ea5t (kho\u1ea3ng 200 \u03a9).<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1540\" src=\"https:\/\/benlongkj.com\/wp-content\/uploads\/2026\/08\/How-to-Run-the-Test-for-continuity.webp\" alt=\"C\u00e1ch th\u1ef1c hi\u1ec7n ki\u1ec3m tra li\u00ean t\u1ee5c\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>T\u1eebng b\u01b0\u1edbc: C\u00e1ch th\u1ef1c hi\u1ec7n ki\u1ec3m tra<\/h2>\n<p>To\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c minh h\u1ecda b\u1eb1ng c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<ul>\n<li>B\u1eadt \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng. Sau \u0111\u00f3 \u0111\u1eb7t n\u00f3 v\u00e0o ch\u1ee9c n\u0103ng ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c (ho\u1eb7c c\u00e0i \u0111\u1eb7t \u2126 th\u1ea5p nh\u1ea5t). Ti\u1ebfp t\u1ee5c c\u1eafm c\u00e1c d\u00e2y. N\u00f3i c\u00e1ch kh\u00e1c, b\u1ea1n c\u1ea7n c\u1eafm d\u00e2y \u0111en v\u00e0o \u1ed5 c\u1eafm g\u1ecdi l\u00e0 C v\u00e0 d\u00e2y \u0111\u1ecf v\u00e0o \u1ed5 c\u1eafm g\u1ecdi l\u00e0 \u2126 (ho\u1eb7c V\u03a9mA). Kh\u00f4ng c\u1eafm d\u00e2y v\u00e0o \u1ed5 c\u1eafm d\u00e0nh cho ampe.<\/li>\n<li>\u0110\u1ea3m b\u1ea3o \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang. \u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y, b\u1ea1n c\u1ea7n ch\u1ea1m c\u1ea3 hai \u0111\u1ea7u que \u0111o. N\u1ebfu m\u1ecdi th\u1ee9 \u0111\u00fang, s\u1ebd c\u00f3 \u00e2m thanh v\u00e0 \u0111i\u1ec7n tr\u1edf b\u1eb1ng kh\u00f4ng s\u1ebd hi\u1ec3n th\u1ecb tr\u00ean m\u00e0n h\u00ecnh (0.0-0.5 \u03a9). N\u1ebfu kh\u00f4ng c\u00f3 g\u00ec x\u1ea3y ra, b\u1ea1n c\u1ea7n ki\u1ec3m tra t\u00ecnh tr\u1ea1ng d\u00e2y, pin c\u0169ng nh\u01b0 v\u1ecb tr\u00ed n\u00fam v\u1eb7n.<\/li>\n<li>\u0110\u1ea3m b\u1ea3o an to\u00e0n cho m\u1ea1ch b\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c quy tr\u00ecnh an to\u00e0n \u2014 t\u1eaft ngu\u1ed3n v\u00e0 k\u00e9o m\u1ed9t \u0111\u1ea7u d\u00e2y ra.<\/li>\n<li>B\u00e2y gi\u1edd, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ea1m que \u0111o v\u00e0o hai \u0111i\u1ec3m m\u00e0 b\u1ea1n mu\u1ed1n ki\u1ec3m tra.<\/li>\n<li>Xem k\u1ebft qu\u1ea3. N\u1ebfu c\u00f3 \u00e2m thanh v\u00e0 \u0111\u1ed3ng h\u1ed3 \u0111\u1ecdc b\u1eb1ng kh\u00f4ng, b\u1ea1n c\u00f3 th\u1ec3 kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng c\u00f3 t\u00ednh li\u00ean t\u1ee5c. N\u1ebfu \u0111\u1ed3ng h\u1ed3 kh\u00f4ng k\u00eau v\u00e0 hi\u1ec3n th\u1ecb OA, b\u1ea1n c\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng kh\u00f4ng c\u00f3 t\u00ednh li\u00ean t\u1ee5c.<\/li>\n<li>\u0110\u1ed1i v\u1edbi r\u01a1le v\u00e0 c\u00f4ng t\u1eafc: ki\u1ec3m tra c\u1ea3 hai v\u1ecb tr\u00ed c\u1ee7a c\u00f4ng t\u1eafc (\u0111\u00f3ng (ON) v\u00e0 m\u1edf (OFF)).<\/li>\n<li>Ghi l\u1ea1i nh\u1eefng g\u00ec b\u1ea1n t\u00ecm th\u1ea5y v\u00e0 l\u1eb7p l\u1ea1i quy tr\u00ecnh cho t\u1ea5t c\u1ea3 c\u00e1c d\u00e2y.<\/li>\n<\/ul>\n<h2>C\u00e1ch \u0111\u1ecdc k\u1ebft qu\u1ea3: Ti\u1ebfng b\u00edp, Ohm &amp; OL<\/h2>\n<p>Ba k\u1ebft qu\u1ea3 c\u00f3 th\u1ec3 x\u1ea3y ra, m\u1ed7i k\u1ebft qu\u1ea3 mang \u00fd ngh\u0129a c\u1ee5 th\u1ec3:<\/p>\n<table>\n<thead>\n<tr>\n<th>Tr\u01b0ng b\u00e0y<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<th>Gi\u1ea3i th\u00edch<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Ti\u1ebfng b\u00edp + 0.0-0.5 \u03a9<\/strong><\/td>\n<td>Li\u00ean t\u1ee5c ho\u00e0n h\u1ea3o<\/td>\n<td>\u0110\u01b0\u1eddng d\u1eabn nguy\u00ean v\u1eb9n \u2014 k\u1ebft n\u1ed1i ng\u1eafn, ch\u1eafc ch\u1eafn<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u00f4ng c\u00f3 ti\u1ebfng b\u00edp + s\u1ed1 nh\u1ecf (v\u00ed d\u1ee5, 2-50 \u03a9)<\/strong><\/td>\n<td>Li\u00ean t\u1ee5c v\u1edbi \u0111i\u1ec7n tr\u1edf<\/td>\n<td>\u0110\u01b0\u1eddng d\u1eabn t\u1ed3n t\u1ea1i nh\u01b0ng b\u1ecb suy gi\u1ea3m \u2014 ti\u1ebfp \u0111i\u1ec3m b\u1ecb \u0103n m\u00f2n, \u0111\u01b0\u1eddng d\u00e2y d\u00e0i, d\u00e2y m\u1ecfng; c\u1ea7n ki\u1ec3m tra c\u00e1c m\u1ea1ch quan tr\u1ecdng<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u00f4ng c\u00f3 ti\u1ebfng b\u00edp + \u201cOL\u201d ho\u1eb7c \u201c1\u201d<\/strong><\/td>\n<td>M\u1ea1ch h\u1edf \/ kh\u00f4ng li\u00ean t\u1ee5c<\/td>\n<td>\u0110\u01b0\u1eddng d\u1eabn b\u1ecb \u0111\u1ee9t \u2014 c\u1ea7u ch\u00ec b\u1ecb ch\u00e1y, d\u00e2y \u0111\u1ee9t, c\u00f4ng t\u1eafc m\u1edf, m\u1ed1i h\u00e0n k\u00e9m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>C\u1ea7n bi\u1ebft hai \u0111i\u1ec3m \u0111\u1eb7c bi\u1ec7t v\u1ec1 \u0111\u1ed3ng h\u1ed3 k\u1ef9 thu\u1eadt s\u1ed1: m\u1ed9t s\u1ed1 hi\u1ec3n th\u1ecb \u201cOL\u201d (Qu\u00e1 t\u1ea3i) v\u00e0 m\u1ed9t s\u1ed1 hi\u1ec3n th\u1ecb \u201c1\u201d nh\u01b0 d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ea1ch h\u1edf. \u0110i\u1ec1u n\u00e0y ch\u1ec9 c\u00f3 ngh\u0129a l\u00e0 \u0111i\u1ec7n tr\u1edf v\u01b0\u1ee3t qu\u00e1 kh\u1ea3 n\u0103ng \u0111o, t\u1ee9c l\u00e0 tr\u01b0\u1eddng h\u1ee3p \u201cv\u00f4 c\u1ef1c.\u201d T\u01b0\u01a1ng t\u1ef1, c\u00e0i \u0111\u1eb7t t\u00ednh li\u00ean t\u1ee5c tr\u00ean m\u1ed9t s\u1ed1 \u0111\u1ed3ng h\u1ed3 c\u00f3 th\u1ec3 k\u00eau khi \u0111\u1ecdc c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf th\u1ea5p (th\u01b0\u1eddng kho\u1ea3ng 30 ohm ho\u1eb7c h\u01a1n), v\u00ec v\u1eady \u0111\u1eebng coi \u00e2m thanh k\u00eau l\u00e0 ch\u1eafc ch\u1eafn.<\/p>\n<h2>\u00dd ngh\u0129a c\u1ee7a gi\u00e1 tr\u1ecb \u0111o Ohm<\/h2>\n<p>N\u1ebfu b\u1ea1n \u0111ang th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i ki\u1ec3m tra \u1edf ch\u1ebf \u0111\u1ed9 \u0111o \u0111i\u1ec7n tr\u1edf thay v\u00ec ch\u1ebf \u0111\u1ed9 k\u00eau, \u0111\u00e2y l\u00e0 c\u00e1ch \u0111\u00e1nh gi\u00e1 c\u00e1c con s\u1ed1:<\/p>\n<ul>\n<li>0 \u03a9 \u2014 m\u1ea1ch ng\u1eafn ho\u00e0n h\u1ea3o: c\u01a1 h\u1ed9i t\u1ed1t nh\u1ea5t cho d\u00e2y ng\u1eafn, ti\u1ebfp \u0111i\u1ec3m c\u00f4ng t\u1eafc ho\u1eb7c c\u1ea7u ch\u00ec.<\/li>\n<li>D\u01b0\u1edbi ~1 \u03a9: \u0111\u1ecdc li\u00ean t\u1ee5c t\u1ed1t \u2014 kh\u00e1 \u0111i\u1ec3n h\u00ecnh khi l\u00e0m vi\u1ec7c v\u1edbi d\u00e2y ng\u1eafn v\u00e0 ti\u1ebfp \u0111i\u1ec3m \u0111\u00f3ng.<\/li>\n<li>1-10 \u03a9 v\u1eabn \u0111\u01b0\u1ee3c coi l\u00e0 li\u00ean t\u1ee5c, nh\u01b0ng c\u00f3 th\u1ec3 ph\u00e1t sinh c\u00e2u h\u1ecfi v\u1ec1 c\u00e1c t\u00e1c \u0111\u1ed9ng li\u00ean quan \u0111\u1ebfn chi\u1ec1u d\u00e0i d\u00e2y s\u1eed d\u1ee5ng, \u0111\u1ea7u n\u1ed1i, kh\u1ea3 n\u0103ng \u0103n m\u00f2n nh\u1eb9, v.v.<\/li>\n<li>Tr\u00ean 10-50 \u03a9: \u0111\u1ecdc \u0111\u01b0\u1eddng d\u00e2y c\u00f3 th\u1ec3 cho th\u1ea5y s\u1ef1 suy gi\u1ea3m\/nguy c\u01a1 \u2014 do ti\u1ebfp \u0111i\u1ec3m b\u1ecb \u0103n m\u00f2n v\u00e0 b\u1ea9n, d\u00e2y b\u1ecb h\u01b0 h\u1ecfng m\u1ed9t ph\u1ea7n, h\u00e0n k\u00e9m. N\u1ebfu k\u1ebft qu\u1ea3 n\u00e0y xu\u1ea5t ph\u00e1t t\u1eeb vi\u1ec7c ki\u1ec3m tra m\u1ea1ch ngu\u1ed3n v\u00e0 m\u1ea1ch n\u1ed1i \u0111\u1ea5t, \u0111\u00e2y \u0111\u01b0\u1ee3c coi l\u00e0 d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o.<\/li>\n<li>OL (\u0111\u1ecdc v\u00f4 c\u1ef1c): kh\u00f4ng c\u00f3 k\u1ebft n\u1ed1i \u2014 m\u1ea1ch h\u1edf.<\/li>\n<\/ul>\n<p>\u0110\u1ecdc 1 ohm c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng li\u00ean t\u1ee5c kh\u00f4ng? T\u1ea5t nhi\u00ean l\u00e0 kh\u00f4ng, \u0111\u00f3 l\u00e0 gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf th\u1ea5p cho th\u1ea5y s\u1ef1 li\u00ean t\u1ee5c t\u1ed1t. Tr\u01b0\u1eddng h\u1ee3p duy nh\u1ea5t c\u1ee7a \u201ckh\u00f4ng li\u00ean t\u1ee5c\u201d l\u00e0 khi xu\u1ea5t hi\u1ec7n \u0111\u1ecdc OL\/\u0111i\u1ec7n tr\u1edf v\u00f4 c\u1ef1c. Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd r\u1eb1ng c\u00f3 kh\u1ea3 n\u0103ng nh\u1ecf r\u1eb1ng v\u1edbi kho\u1ea3ng c\u00e1ch d\u00e2y r\u1ea5t d\u00e0i v\u00e0 ti\u1ebfp \u0111i\u1ec3m k\u00e9m, \u0111i\u1ec7n tr\u1edf c\u00f3 th\u1ec3 cao h\u01a1n 1 ohm.<\/p>\n<h2>Ki\u1ec3m tra th\u1ef1c t\u1ebf: D\u00e2y, C\u1ea7u ch\u00ec, C\u00f4ng t\u1eafc, C\u00e1p<\/h2>\n<p>B\u1ed1n b\u00e0i ki\u1ec3m tra \u0111\u01a1n gi\u1ea3n, th\u1ef1c hi\u1ec7n theo c\u00f9ng m\u1ed9t c\u00e1ch:<\/p>\n<ul>\n<li>C\u1ea7u ch\u00ec: ki\u1ec3m tra m\u1ed7i \u0111\u1ea7u n\u1eafp. Ti\u1ebfng b\u00edp c\u00f3 ngh\u0129a l\u00e0 c\u1ea7u ch\u00ec c\u00f2n t\u1ed1t, trong khi OL ngh\u0129a l\u00e0 c\u1ea7u ch\u00ec b\u1ecb ch\u00e1y. B\u00e0i ki\u1ec3m tra n\u00e0y tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi, \u201c1 ohm c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng li\u00ean t\u1ee5c kh\u00f4ng?\u201d C\u1ea7u ch\u00ec t\u1ed1t s\u1ebd c\u00f3 \u0111\u1ecdc g\u1ea7n 0 \u03a9.<\/li>\n<li>L\u00f5i d\u00e2y\/c\u00e1p: ki\u1ec3m tra m\u1ed7i \u0111\u1ea7u d\u00e2y. Khi x\u1eed l\u00fd c\u00e1p \u0111a l\u00f5i, quan tr\u1ecdng l\u00e0 ki\u1ec3m tra t\u1eebng l\u00f5i c\u0169ng nh\u01b0 ki\u1ec3m tra gi\u1eefa c\u00e1c l\u00f5i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 ch\u1eadp m\u1ea1ch (OL ngh\u0129a l\u00e0 c\u00e1ch \u0111i\u1ec7n t\u1ed1t).<\/li>\n<li>Ti\u1ebfp \u0111i\u1ec3m c\u00f4ng t\u1eafc\/r\u01a1 le: ki\u1ec3m tra hai \u0111\u1ea7u c\u1ef1c. Nh\u1ea5n c\u00f4ng t\u1eafc. Khi c\u00f4ng t\u1eafc \u0111\u00f3ng, n\u00f3 n\u00ean ph\u00e1t ti\u1ebfng b\u00edp v\u00e0 khi m\u1edf th\u00ec s\u1ebd hi\u1ec3n th\u1ecb OL. N\u1ebfu n\u00f3 b\u00edp \u1edf c\u1ea3 hai v\u1ecb tr\u00ed, c\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ecb ch\u1eadp. N\u1ebfu kh\u00f4ng bao gi\u1edd b\u00edp, c\u00e1c ti\u1ebfp \u0111i\u1ec3m b\u1ecb l\u1ed7i.<\/li>\n<li>N\u1ed1i \u0111\u1ea5t: ki\u1ec3m tra gi\u1eefa d\u00e2y n\u1ed1i \u0111\u1ea5t v\u00e0 thanh \u0111\u1ea5t. \u0110i\u1ec7n tr\u1edf th\u1ea5p x\u00e1c nh\u1eadn k\u1ebft n\u1ed1i c\u00f2n nguy\u00ean v\u1eb9n.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1541\" src=\"https:\/\/benlongkj.com\/wp-content\/uploads\/2026\/08\/Troubleshooting-a-Multimeter-That-Wont-Test.webp\" alt=\"Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng kh\u00f4ng ki\u1ec3m tra \u0111\u01b0\u1ee3c\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng kh\u00f4ng ki\u1ec3m tra \u0111\u01b0\u1ee3c<\/h2>\n<table>\n<thead>\n<tr>\n<th>Tri\u1ec7u ch\u1ee9ng<\/th>\n<th>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3<\/th>\n<th>Kh\u1eafc ph\u1ee5c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kh\u00f4ng c\u00f3 ti\u1ebfng b\u00edp khi que \u0111o ch\u1ea1m v\u00e0o<\/td>\n<td>Pin h\u1ebft, d\u00e2y \u0111o ch\u01b0a c\u1eafm, v\u1ecb tr\u00ed n\u00fam xoay sai<\/td>\n<td>Ki\u1ec3m tra bi\u1ec3u t\u01b0\u1ee3ng pin; c\u1eafm l\u1ea1i d\u00e2y \u0111o; x\u00e1c nh\u1eadn n\u00fam xoay \u1edf ch\u1ebf \u0111\u1ed9 li\u00ean t\u1ee5c\/\u03a9<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ecdc s\u1ed1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh<\/td>\n<td>K\u1ebft n\u1ed1i que \u0111o l\u1ecfng, \u0111\u1ea7u que \u0111o b\u1ecb \u0103n m\u00f2n, d\u00e2y di chuy\u1ec3n<\/td>\n<td>V\u1ec7 sinh \u0111\u1ea7u que, si\u1ebft ch\u1eb7t k\u1ebft n\u1ed1i, gi\u1eef que \u0111o c\u1ed1 \u0111\u1ecbnh<\/td>\n<\/tr>\n<tr>\n<td>Hi\u1ec3n th\u1ecb OL tr\u00ean d\u00e2y \u0111\u00e3 bi\u1ebft t\u1ed1t<\/td>\n<td>Ph\u1ea1m vi sai, que \u0111o h\u1ecfng, ho\u1eb7c d\u00e2y th\u1ef1c s\u1ef1 b\u1ecb \u0111\u1ee9t<\/td>\n<td>T\u1ef1 ki\u1ec3m tra v\u1edbi que \u0111o ch\u1ea1m nhau; ki\u1ec3m tra d\u00e2y n\u1ed1i \u0111\u00e3 bi\u1ebft t\u1ed1t; thay d\u00e2y \u0111o<\/td>\n<\/tr>\n<tr>\n<td>Ph\u00e1t ti\u1ebfng b\u00edp tr\u00ean m\u1ecdi th\u1ee9<\/td>\n<td>Que \u0111o b\u1ecb ch\u1eadp v\u1edbi nhau, ho\u1eb7c \u0111o \u0111\u01b0\u1eddng song song<\/td>\n<td>T\u00e1ch que \u0111o; ng\u1eaft m\u1ed9t \u0111\u1ea7u c\u1ee7a linh ki\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>M\u00e0n h\u00ecnh hi\u1ec3n th\u1ecb \u0111i\u1ec7n \u00e1p thay v\u00ec ohm<\/td>\n<td>N\u00fam xoay kh\u00f4ng \u1edf ch\u1ebf \u0111\u1ed9 li\u00ean t\u1ee5c, ho\u1eb7c \u0111\u1ed3ng h\u1ed3 \u1edf ch\u1ebf \u0111\u1ed9 t\u1ef1 \u0111\u1ed9ng \u0111o \u0111i\u1ec7n \u00e1p<\/td>\n<td>Ki\u1ec3m tra v\u1ecb tr\u00ed n\u00fam xoay v\u00e0 \u0111\u01a1n v\u1ecb hi\u1ec3n th\u1ecb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Li\u00ean t\u1ee5c so v\u1edbi \u0110i\u1ec7n tr\u1edf: Khi n\u00e0o d\u00f9ng c\u00e1i n\u00e0o<\/h2>\n<p>Ch\u1ebf \u0111\u1ed9 li\u00ean t\u1ee5c v\u00e0 ch\u1ebf \u0111\u1ed9 \u0111i\u1ec7n tr\u1edf l\u00e0 hai ch\u1ebf \u0111\u1ed9 li\u00ean quan; ch\u00fang s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t ph\u00e9p \u0111o nh\u01b0ng tr\u00ecnh b\u00e0y kh\u00e1c nhau:<\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>Ch\u1ebf \u0111\u1ed9 li\u00ean t\u1ee5c<\/th>\n<th>Ch\u1ebf \u0111\u1ed9 \u0111i\u1ec7n tr\u1edf (\u03a9)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra<\/td>\n<td>Ti\u1ebfng b\u00edp + hi\u1ec3n th\u1ecb<\/td>\n<td>S\u1ed1 \u0111o b\u1eb1ng ohm<\/td>\n<\/tr>\n<tr>\n<td>Ph\u00f9 h\u1ee3p nh\u1ea5t cho<\/td>\n<td>Ki\u1ec3m tra nhanh c\u00f3\/kh\u00f4ng (d\u00e2y, c\u1ea7u ch\u00ec, c\u00f4ng t\u1eafc)<\/td>\n<td>\u0110o gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf th\u1ef1c t\u1ebf (cu\u1ed9n d\u00e2y, c\u1ea3m bi\u1ebfn, ph\u1ea7n t\u1eed gia nhi\u1ec7t)<\/td>\n<\/tr>\n<tr>\n<td>Ng\u01b0\u1ee1ng<\/td>\n<td>Ph\u00e1t ti\u1ebfng b\u00edp d\u01b0\u1edbi ~30 \u03a9 (\u0111i\u1ec3n h\u00ecnh)<\/td>\n<td>Hi\u1ec3n th\u1ecb b\u1ea5t k\u1ef3 gi\u00e1 tr\u1ecb n\u00e0o trong ph\u1ea1m vi<\/td>\n<\/tr>\n<tr>\n<td>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/td>\n<td>Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 nhanh<\/td>\n<td>Ki\u1ec3m tra v\u00e0 ch\u1ea9n \u0111o\u00e1n linh ki\u1ec7n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ki\u1ec3m tra li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c c\u00e2u h\u1ecfi \u201cn\u00f3 c\u00f3 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i kh\u00f4ng\u201d, trong khi ch\u1ebf \u0111\u1ed9 \u0111o \u0111i\u1ec7n tr\u1edf n\u00ean d\u00f9ng cho c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ea7n \u0111o ch\u00ednh x\u00e1c, nh\u01b0 x\u00e1c minh \u0111i\u1ec7n tr\u1edf quy \u0111\u1ecbnh c\u1ee7a cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 ho\u1eb7c b\u1ed9 gia nhi\u1ec7t. Trong s\u1ea3n xu\u1ea5t t\u1ef1 \u0111\u1ed9ng s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i c\u00e1c k\u1ebft n\u1ed1i v\u00e0 \u0111o \u0111i\u1ec7n tr\u1edf, hai kh\u00e1i ni\u1ec7m n\u00e0y \u2014 x\u00e1c minh k\u1ebft n\u1ed1i v\u00e0 \u0111o \u0111i\u1ec7n tr\u1edf \u2014 l\u00e0 m\u1ed9t trong nh\u1eefng vi\u1ec7c m\u00e0 c\u00e1c d\u00e2y chuy\u1ec1n ki\u1ec3m tra t\u1ef1 \u0111\u1ed9ng th\u1ef1c hi\u1ec7n h\u00e0ng ng\u00e0n l\u1ea7n m\u1ed7i ng\u00e0y, v\u00e0 hi\u1ec3u ch\u00fang l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho cu\u1ed9c tranh lu\u1eadn gi\u1eefa ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra th\u1ee7 c\u00f4ng v\u00e0 t\u1ef1 \u0111\u1ed9ng.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>\u0110\u1ecdc s\u1ed1 x\u1ea5u cho ki\u1ec3m tra li\u00ean t\u1ee5c l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u1ecdc li\u00ean t\u1ee5c \u0111\u01b0\u1ee3c coi l\u00e0 x\u1ea5u n\u1ebfu n\u00f3 cho k\u1ebft qu\u1ea3 m\u1edf ho\u1eb7c bi\u00ean khi l\u1ebd ra ph\u1ea3i ch\u1ec9 ra li\u00ean t\u1ee5c t\u1ed1t. \u201cOL\u201d (\u0111i\u1ec7n tr\u1edf v\u00f4 c\u1ef1c) ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 li\u00ean t\u1ee5c; t\u1ee9c l\u00e0 c\u00f3 th\u1ee9 g\u00ec \u0111\u00f3 \u0111\u00e3 l\u00e0m \u0111\u1ee9t m\u1ea1ch, nh\u01b0 d\u00e2y \u0111\u1ee9t, c\u1ea7u ch\u00ec ch\u00e1y ho\u1eb7c c\u00f4ng t\u1eafc m\u1edf. C\u00e1c ph\u00e9p \u0111o k\u1ebft n\u1ed1i l\u1edbn h\u01a1n 10-50 \u03c9 trong m\u1ea1ch ng\u1eafn c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c ch\u00fa \u00fd v\u00ec c\u00e1c k\u1ebft qu\u1ea3 n\u00e0y c\u00f3 th\u1ec3 ch\u1ec9 ra \u0103n m\u00f2n, ti\u1ebfp \u0111i\u1ec3m k\u00e9m ho\u1eb7c d\u00e2y b\u1ecb \u0111\u1ee9t m\u1ed9t ph\u1ea7n. Trong tr\u01b0\u1eddng h\u1ee3p d\u00e2y ng\u1eafn ho\u1eb7c c\u00f4ng t\u1eafc \u0111\u00f3ng, k\u1ef3 v\u1ecdng l\u00e0 \u0111o \u0111\u01b0\u1ee3c kho\u1ea3ng kh\u00f4ng ohm ho\u1eb7c r\u1ea5t g\u1ea7n v\u1edbi gi\u00e1 tr\u1ecb \u0111\u00f3.<\/p>\n<h3>K\u00fd hi\u1ec7u cho li\u00ean t\u1ee5c tr\u00ean \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng l\u00e0 g\u00ec?<\/h3>\n<p>D\u1ea5u hi\u1ec7u li\u00ean t\u1ee5c gi\u1ed1ng nh\u01b0 s\u00f3ng \u00e2m, l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng cong c\u00f3 c\u00e1c v\u00f2ng cung nh\u1ecf t\u00e1ch ra t\u1eeb n\u00f3. D\u1ea5u hi\u1ec7u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1eb7t c\u1ea1nh d\u1ea5u ohm ho\u1eb7c d\u1ea5u loa. C\u00e1c \u0111\u1ed3ng h\u1ed3 \u0111o kh\u00f4ng c\u00f3 ch\u1ee9c n\u0103ng li\u00ean t\u1ee5c ri\u00eang bi\u1ec7t s\u1eed d\u1ee5ng m\u1ee9c \u0111i\u1ec7n tr\u1edf th\u1ea5p nh\u1ea5t. \u0110\u00f4i khi c\u00f3 ch\u1eef \u201cCONT\u201d \u0111\u01b0\u1ee3c in b\u00ean c\u1ea1nh bi\u1ec3u t\u01b0\u1ee3ng li\u00ean t\u1ee5c ho\u1eb7c d\u1ea5u diode g\u1ea7n \u0111\u00f3, v\u00ec v\u1eady h\u00e3y ki\u1ec3m tra c\u00e1c k\u00fd hi\u1ec7u tr\u00ean \u0111\u1ed3ng h\u1ed3 v\u00e0 h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng.<\/p>\n<h3>\u0110\u1ecdc ohm ch\u00ednh x\u00e1c cho li\u00ean t\u1ee5c l\u00e0 g\u00ec?<\/h3>\n<p>N\u1ebfu k\u1ebft n\u1ed1i t\u1ed1t \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp qua d\u00e2y, \u0111\u00f3ng ti\u1ebfp \u0111i\u1ec3m ho\u1eb7c c\u1ea7u ch\u00ec, k\u1ebft qu\u1ea3 \u0111o n\u00ean kho\u1ea3ng b\u1eb1ng kh\u00f4ng ohm (th\u01b0\u1eddng l\u00e0 0 \u2013 0,5 ohm k\u00e8m theo ti\u1ebfng b\u00edp). \u0110\u1ed1i v\u1edbi kho\u1ea3ng c\u00e1ch d\u00e0i h\u01a1n ho\u1eb7c n\u01a1i s\u1eed d\u1ee5ng \u0111\u1ea7u n\u1ed1i, k\u1ebft qu\u1ea3 \u0111o l\u00ean \u0111\u1ebfn v\u00e0i ohm v\u1eabn \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn. \u0110i\u1ec3m quan tr\u1ecdng c\u1ea7n l\u01b0u \u00fd l\u00e0 b\u1ea5t k\u1ef3 k\u1ebft qu\u1ea3 \u0111o n\u00e0o kh\u00f4ng ph\u1ea3i v\u00f4 c\u1ef1c \u0111\u1ec1u c\u00f3 ngh\u0129a l\u00e0 li\u00ean t\u1ee5c c\u00f2n nguy\u00ean v\u1eb9n, v\u00e0 \u201cOL\u201d (v\u00f4 c\u1ef1c) c\u00f3 ngh\u0129a l\u00e0 m\u1ea1ch ch\u01b0a ho\u00e0n ch\u1ec9nh.<\/p>\n<h3>1 ohm c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng li\u00ean t\u1ee5c kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng c\u00f3 1 ohm c\u00f3 ngh\u0129a l\u00e0 li\u00ean t\u1ee5c tuy\u1ec7t v\u1eddi. \u0110i\u1ec7n tr\u1edf th\u1ea5p nh\u01b0 1 \u03a9 cho th\u1ea5y d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 ch\u1ea3y t\u1ef1 do qua n\u00f3, \u0111i\u1ec1u n\u00e0y ch\u00ednh x\u00e1c l\u00e0 \u0111i\u1ec1u ng\u01b0\u1eddi ta mong \u0111\u1ee3i \u0111\u1ed1i v\u1edbi d\u00e2y, c\u1ea7u ch\u00ec ho\u1eb7c c\u00f4ng t\u1eafc \u0111\u00f3ng. \u201cKh\u00f4ng li\u00ean t\u1ee5c\u201d ch\u1ec9 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng OL (qu\u00e1 t\u1ea3i\/\u0111i\u1ec7n tr\u1edf v\u00f4 c\u1ef1c). Th\u1ef1c t\u1ebf, 1 \u03a9 ch\u1ec9 l\u00e0 cao \u0111\u1ed1i v\u1edbi d\u00e2y d\u1eabn r\u1ea5t ng\u1eafn v\u00e0 d\u00e0y, nh\u01b0ng n\u00f3 v\u1eabn cho th\u1ea5y \u0111\u01b0\u1eddng d\u1eabn c\u00f2n nguy\u00ean v\u1eb9n.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.fluke.com\/en-us\/learn\/best-practices\/measurement-basics\/electricity\/what-is-continuity\" rel=\"nofollow noopener\" target=\"_blank\">Fluke \u2014 Li\u00ean t\u1ee5c l\u00e0 g\u00ec v\u00e0 c\u00e1ch ki\u1ec3m tra n\u00f3<\/a><\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC 61010 \u2014 Y\u00eau c\u1ea7u an to\u00e0n cho thi\u1ebft b\u1ecb \u0111i\u1ec7n \u0111o l\u01b0\u1eddng<\/a><\/li>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70 (NEC) \u2014 Y\u00eau c\u1ea7u ki\u1ec3m tra v\u00e0 b\u1ea3o tr\u00ec<\/a><\/li>\n<li><a href=\"https:\/\/www.keysight.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Keysight \u2014 C\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n v\u1ec1 \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng v\u00e0 \u0111o \u0111i\u1ec7n tr\u1edf<\/a><\/li>\n<li><a href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.303\" rel=\"nofollow noopener\" target=\"_blank\">OSHA \u2014 An to\u00e0n \u0111i\u1ec7n v\u00e0 th\u1ef1c h\u00e0nh ki\u1ec3m tra<\/a><\/li>\n<li><a href=\"https:\/\/www.eaton.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Eaton \u2014 H\u01b0\u1edbng d\u1eabn ki\u1ec3m tra v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 \u0111i\u1ec7n<\/a><\/li>\n<\/ol>\n<h2>Ph\u1ea7n k\u1ebft lu\u1eadn<\/h2>\n<p>Trong s\u1ed1 nhi\u1ec1u \u0111i\u1ec1u b\u1ea1n s\u1ebd h\u1ecdc khi nghi\u00ean c\u1ee9u c\u00f4ng vi\u1ec7c \u0111i\u1ec7n, ki\u1ec3m tra li\u00ean t\u1ee5c c\u00f3 l\u1ebd l\u00e0 k\u1ef9 n\u0103ng qu\u00fd gi\u00e1 nh\u1ea5t m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c trong l\u0129nh v\u1ef1c n\u00e0y: ng\u1eaft ngu\u1ed3n \u0111i\u1ec7n m\u1ea1ch, \u0111\u1eb7t \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u1edf ch\u1ebf \u0111\u1ed9 li\u00ean t\u1ee5c (ho\u1eb7c \u1edf m\u1ee9c \u03a9 th\u1ea5p nh\u1ea5t), ki\u1ec3m tra que \u0111o c\u1ee7a n\u00f3, \u0111\u1eb7t que \u0111o v\u00e0o hai \u0111i\u1ec3m ki\u1ec3m tra, v\u00e0 l\u1ea5y k\u1ebft qu\u1ea3. N\u1ebfu b\u1ea1n nghe ti\u1ebfng b\u00edp v\u00e0 \u0111\u1ecdc g\u1ea7n b\u1eb1ng kh\u00f4ng ohm, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n c\u00f3 li\u00ean t\u1ee5c; OL cho th\u1ea5y m\u1ea1ch \u0111ang m\u1edf; b\u1ea5t k\u1ef3 s\u1ed1 n\u00e0o \u1edf gi\u1eefa cho th\u1ea5y m\u1ea1ch b\u1ecb l\u1ed7i. B\u1ea1n s\u1ebd c\u00f3 th\u1ec3 ph\u00e2n t\u00edch c\u00e1c v\u1ea5n \u0111\u1ec1 m\u1ea1ch m\u00e0 kh\u00f4ng s\u1ee3 h\u00e3i sau khi th\u00e0nh th\u1ea1o ki\u1ec3m tra li\u00ean t\u1ee5c. Tr\u00ean s\u00e0n s\u1ea3n xu\u1ea5t, logic x\u00e1c minh \u0111\u00f3 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng th\u00e0nh c\u00e1c h\u1ec7 th\u1ed1ng ki\u1ec3m tra t\u1ef1 \u0111\u1ed9ng \u2014 ph\u00e2n t\u00edch ho\u00e0n v\u1ed1n c\u1ee7a <a href=\"https:\/\/benlongkj.com\/vi\/blog\/fully-automated-vs-semi-automated\/\" rel=\"nofollow\">d\u00e2y chuy\u1ec1n t\u1ef1 \u0111\u1ed9ng ho\u00e0n to\u00e0n v\u00e0 b\u00e1n t\u1ef1 \u0111\u1ed9ng<\/a> v\u00e0 c\u00e1c con s\u1ed1 hi\u1ec7u qu\u1ea3 trong <a href=\"https:\/\/benlongkj.com\/vi\/blog\/industrial-automation-solutions-efficiency-benefits\/\" rel=\"nofollow\">t\u1ed5ng quan hi\u1ec7u qu\u1ea3 t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p c\u1ee7a ch\u00fang t\u00f4i<\/a> cho th\u1ea5y t\u1ea1i sao ki\u1ec3m tra k\u1ebft n\u1ed1i \u1edf quy m\u00f4 l\u1edbn l\u00e0 ng\u01b0\u1eddi b\u1ea1n t\u1ed1t nh\u1ea5t c\u1ee7a nh\u00e0 m\u00e1y.<\/p>","protected":false},"excerpt":{"rendered":"<p>Every electrician, technician, and DIYer bears the burden of the same dilemma: is this wire connected properly? Is this fuse blown? Is this switch wired properly? Can this cable be damaged somewhere within the insulation? The quickest solution to that problem is to conduct a continuity test using a multimeter \u2014 a two-minute procedure which [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1538","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/posts\/1538","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/comments?post=1538"}],"version-history":[{"count":6,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/posts\/1538\/revisions"}],"predecessor-version":[{"id":1549,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/posts\/1538\/revisions\/1549"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/media\/1539"}],"wp:attachment":[{"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/media?parent=1538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/categories?post=1538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/benlongkj.com\/vi\/wp-json\/wp\/v2\/tags?post=1538"}],"curies":[{"name":"trang web","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}